The 584 Aring; photoelectron spectra ofnhyphen;H2,phyphen;H2, HD, and D2were recorded at a resolution of 11 meV FWHM using a supersonic molecular beam source. Spectra were taken at several stagnation temperatures and pressures in order to vary the rotational population distribution in the beam with a corresponding variation in the relative intensities of the rotational transitions. Many of theQhyphen;branch components were resolved for the first time. Dgr;G(v+1/2) andBvvalues were measured for all observed vibrational states of H+2, HD+, and D+2and were used to determined the ionic vibrational and rotational constants: ohgr;e, ohgr;exe, ohgr;eye, ohgr;eze,Be, and agr;e. The results represent a substantial improvement over previous experimental determinations and were found to be consistent with the available theoretical rotationhyphen;vibration energy levels. The measurement of the intensity distribution of photoelectrons as a function of vibrational states yielded photoionization cross sections which were in good agreement with the theoretical values calculated by Oprime;Niel and Reinhardt.
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